txstang84: Your 39-2 was manufactured in 1971 in the serial number range A115001 to A156801. The 39-2 was introduced in 1971 and has an alloy frame and a steel slide. Model 39s made prior to this had a steel frame. The model 39 was produced from 1954-1982. It was effectively replaced by the model 539 & 639 'second generation' S&W automatics.